English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Recently, mid-infrared instruments have become available on several largeground-based telescopes, resulting in data sets with unprecedented spatialresolution at these long wavelengths. In this paper we examine'ground-based-only' diagnostics, which can be used in the study of star-formingregions in starburst galaxies. By combining output from the stellar populationsynthesis code Starburst 99 with the photoionization code Mappings, we modelstellar clusters and their surrounding interstellar medium, focusing on theevolution of emission lines in the N- and Q-band atmospheric windows (8-13 and16.5-24.5 micron respectively) and those in the near-infrared. We address thedetailed sensitivity of various emission line diagnostics to stellar populationage, metallicity, nebular density, and ionization parameter. Using our modelresults, we analyze observations of two stellar clusters in the overlap regionof the Antennae galaxies obtained with VLT Imager and Spectrometer for midInfrared (VISIR). We find evidence for clumpy, high density, ionized gas. Thetwo clusters are young (younger than 2.5 and 3 Myr respectively), thesurrounding interstellar matter is dense (10^4 cm^-3 or larger) and can becharacterized by a high ionization parameter (logU > -1.53). Detailed analysisof the mid-infrared spectral features shows that a (near-)homogeneous mediumcannot account for the observations, and that complex structure on scales belowthe resolution limit, containing several young stellar clusters embedded inclumpy gas, is more likely.

Mid-infrared diagnostics of starburst galaxies: clumpy, dense structures in star-forming regions in the Antennae (NGC 4038/4039)